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THE 3D STRUCTURE OF THE PH 4.75 FORM OF THE ASCARIS TRYPSIN
INHIBITOR IN SOLUTION BY NMR IS BASED ON 1078 EXPERIMENTAL
RESTRAINTS COMPRISING: 43 SHORT RANGE (1 < |I-J| <=5) AND
218 LONG RANGE (|I-J|>5) INTERRESIDUE INTERPROTON
DISTANCE RESTRAINTS, 320 INTRARESIDUE INTERPROTON DISTANCE
RESTRAINTS, 48 DISTANCE RESTRAINTS FOR 4 HYDROGEN BONDS,
AND 59 PHI, 49 PSI AND 41 CHI1 TORSION ANGLE RESTRAINTS. A
COMPLETE LIST OF EXPERIMENTAL RESTRAINTS HAS BEEN
DEPOSITED WITH THE BROOKHAVEN DATA BANK.
THE STRUCTURES ARE CALCULATED USING THE HYBRID METRIC
MATRIX DISTANCE GEOMETRY-DYNAMICAL SIMULATED ANNEALING
METHOD DESCRIBED BY: NILGES, M., CLORE, G.M. &
GRONENBORN, A.M. (1988) FEBS LETT 29, 317-324 ALL
STRUCTURAL STATISTICS ARE GIVEN IN REFERENCE 1.
THE RESTRAINED MINIMIZED AVERAGE STRUCTURE (SA)R IS
PRESENTED IN PROTEIN DATA BANK ENTRY 1ATA. THIS IS
OBTAINED BY FIRST AVERAGING THE COORDINATES OF THE
INDIVIDUAL 32 DYNAMICAL SIMULATED ANNEALING SA STRUCTURES
BEST FITTED TO RESIDUES 5 - 60, AND SUBJECTING THE
RESULTING COORDINATES TO RESTRAINED MINIMIZATION. THE
QUANTITY PRESENTED IN COLUMNS 61 - 66 IN ENTRY 1ATA (THE B
VALUE FIELD IN X-RAY STRUCTURES) GIVES THE AVERAGE RMS
DIFFERENCE BETWEEN THE INDIVIDUAL SA STRUCTURES AND THE
MEAN STRUCTURE. THE QUANTITIES IN THIS FIELD OF THE
INDIVIDUAL STRUCTURES IN THIS ENTRY HAVE NO MEANING. |
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